Short-term effects of biochar on soil CO2 efflux in boreal Scots pine forests
Short-term effects of biochar on soil CO2 efflux in boreal Scots pine forests
复制标题
DOI：
10.1007/s13595-020-00960-2
复制
发表时间：
2020-03
影响因子：
3
通讯作者：
Xudan Zhu;T. Zhu;J. Pumpanen;Marjo Palviainen;Xuan Zhou;L. Kulmala;V. Bruckman;E. Köster;Kajar Köster;Heidi Aaltonen;N. Makita;Yixiang Wang;F. Berninger
中科院分区：
文献类型：
--
作者：
Xudan Zhu;T. Zhu;J. Pumpanen;Marjo Palviainen;Xuan Zhou;L. Kulmala;V. Bruckman;E. Köster;Kajar Köster;Heidi Aaltonen;N. Makita;Yixiang Wang;F. Berninger
Key messageDuring the first summer，wood biochar amendments increased soil temperature，pH，and soil CO2 effluxes in a xeric boreal Scots pine forest.土壤CO2排放量的增加在很大程度上可以通过土壤温度的升高来解释。较高的生物炭施用量（1.0和0.5 kg m−2）导致土壤CO2排放量增加，而生物炭的热解温度（500或650 °C）对土壤CO2排放量没有影响。然而，更快的土壤有机质周转后，生物炭的应用可能会降低生物炭应用的有效性。为了更好地了解生物质炭对北方森林土壤的影响，本研究采用了两种不同热解温度的云杉生物质炭（500 °C和650 °C）的量为1.0和0.5 kg m-2的干旱苏格兰松林在芬兰南部。和理化性质进行了测量，以跟踪生物炭应用后的变化在第一个summer.ResultsSoil CO2增加14.3%，1.0 kg m-2的治疗和4.6%，0.5 kg m-2。1.0 kg m-2处理的土壤温度和pH值明显高于对照。经土壤温度和土壤水分校正后，各处理间土壤CO2的差异消失。结论短期内生物炭主要通过提高土壤温度来增加土壤CO2。较高的生物炭施用量导致较高的土壤CO2排放量。土壤CO2排放量的增加可能是暂时的。生物炭在北方森林固碳中的最佳用量有待进一步研究。
Key messageDuring the first summer, wood biochar amendments increased soil temperature, pH, and soil CO2effluxes in a xeric boreal Scots pine forest. The increase of soil CO2efflux could be largely explained by increases in by soil temperature. Higher biochar application rates (1.0 vs 0.5 kg m−2) led to higher soil CO2efflux while the pyrolysis temperature of biochar (500 or 650 °C) had no effect on soil CO2efflux.ContextUsing biochar as a soil amendment has been proposed to increase the carbon sequestration in soils. However, a more rapid soil organic matter turnover after biochar application might reduce the effectiveness of biochar applications for carbon sequestration. By raising the pyrolysis temperature, biochar with lower contents of labile carbohydrates can be produced.AimsTo better understand the effects of biochar on boreal forest soil, we applied two spruce biochar with different pyrolysis temperatures (500 °C and 650 °C) at amounts of 1.0 and 0.5 kg m−2in a young xeric Scots pine forest in southern Finland.MethodsSoil CO2, microbial biomass, and physiochemical properties were measured to track changes after biochar application during the first summer.ResultsSoil CO2increased 14.3% in 1.0 kg m−2treatments and 4.6% in 0.5 kg m−2. Soil temperature and pH were obviously higher in the 1.0 kg m−2treatments. Differences in soil CO2among treatments disappear after correcting by soil temperature and soil moisture.ConclusionBiochar increased soil CO2mainly by raising soil temperature in the short term. Higher biochar application rates led to higher soil CO2effluxes. The increase in soil CO2efflux may be transient. More studies are needed to get the optimum biochar amount for carbon sequestration in boreal forest.